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nxt_kqueue_engine.c
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
/*
* kqueue() has been introduced in FreeBSD 4.1 and then was ported
* to OpenBSD 2.9, MacOSX 10.3 (Panther), and NetBSD 2.0.
* DragonFlyBSD inherited it with FreeBSD 4 code base.
*
* NOTE_REVOKE has been introduced in FreeBSD 4.3 and then was ported
* to OpenBSD 2.9, MacOSX 10.3 (Panther), and NetBSD 2.0.
* DragonFlyBSD inherited it with FreeBSD 4 code base.
*
* EVFILT_TIMER has been introduced in FreeBSD 4.4-STABLE and then was
* ported to NetBSD 2.0, MacOSX 10.4 (Tiger), and OpenBSD 4.2.
* DragonFlyBSD inherited it with FreeBSD 4 code base.
*
* EVFILT_USER and EV_DISPATCH have been introduced in MacOSX 10.6 (Snow
* Leopard) as part of the Grand Central Dispatch framework
* and then were ported to FreeBSD 8.0-STABLE as part of the
* libdispatch support.
*/
/*
* EV_DISPATCH is better because it just disables an event on delivery
* whilst EV_ONESHOT deletes the event. This eliminates in-kernel memory
* deallocation and probable subsequent allocation with a lock acquiring.
*/
#ifdef EV_DISPATCH
#define NXT_KEVENT_ONESHOT EV_DISPATCH
#else
#define NXT_KEVENT_ONESHOT EV_ONESHOT
#endif
#if (NXT_NETBSD)
/* NetBSD defines the kevent.udata field as intptr_t. */
#define nxt_kevent_set_udata(udata) (intptr_t) (udata)
#define nxt_kevent_get_udata(udata) (void *) (udata)
#else
#define nxt_kevent_set_udata(udata) (void *) (udata)
#define nxt_kevent_get_udata(udata) (udata)
#endif
static nxt_int_t nxt_kqueue_create(nxt_event_engine_t *engine,
nxt_uint_t mchanges, nxt_uint_t mevents);
static void nxt_kqueue_free(nxt_event_engine_t *engine);
static void nxt_kqueue_enable(nxt_event_engine_t *engine, nxt_fd_event_t *ev);
static void nxt_kqueue_disable(nxt_event_engine_t *engine, nxt_fd_event_t *ev);
static void nxt_kqueue_delete(nxt_event_engine_t *engine, nxt_fd_event_t *ev);
static nxt_bool_t nxt_kqueue_close(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_enable_read(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_enable_write(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_disable_read(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_disable_write(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_block_read(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_block_write(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_oneshot_read(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_oneshot_write(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_enable_accept(nxt_event_engine_t *engine,
nxt_fd_event_t *ev);
static void nxt_kqueue_enable_file(nxt_event_engine_t *engine,
nxt_file_event_t *ev);
static void nxt_kqueue_close_file(nxt_event_engine_t *engine,
nxt_file_event_t *ev);
static void nxt_kqueue_fd_set(nxt_event_engine_t *engine, nxt_fd_event_t *ev,
nxt_int_t filter, nxt_uint_t flags);
static struct kevent *nxt_kqueue_get_kevent(nxt_event_engine_t *engine);
static void nxt_kqueue_error(nxt_event_engine_t *engine);
static void nxt_kqueue_fd_error_handler(nxt_task_t *task, void *obj,
void *data);
static void nxt_kqueue_file_error_handler(nxt_task_t *task, void *obj,
void *data);
static nxt_int_t nxt_kqueue_add_signal(nxt_event_engine_t *engine,
const nxt_sig_event_t *sigev);
#if (NXT_HAVE_EVFILT_USER)
static nxt_int_t nxt_kqueue_enable_post(nxt_event_engine_t *engine,
nxt_work_handler_t handler);
static void nxt_kqueue_signal(nxt_event_engine_t *engine, nxt_uint_t signo);
#endif
static void nxt_kqueue_poll(nxt_event_engine_t *engine, nxt_msec_t timeout);
static void nxt_kqueue_conn_io_connect(nxt_task_t *task, void *obj,
void *data);
static void nxt_kqueue_conn_connected(nxt_task_t *task, void *obj,
void *data);
static void nxt_kqueue_listen_handler(nxt_task_t *task, void *obj, void *data);
static void nxt_kqueue_conn_io_accept(nxt_task_t *task, void *obj,
void *data);
static void nxt_kqueue_conn_io_read(nxt_task_t *task, void *obj,
void *data);
static ssize_t nxt_kqueue_conn_io_recvbuf(nxt_conn_t *c, nxt_buf_t *b);
static nxt_conn_io_t nxt_kqueue_conn_io = {
.connect = nxt_kqueue_conn_io_connect,
.accept = nxt_kqueue_conn_io_accept,
.read = nxt_kqueue_conn_io_read,
.recvbuf = nxt_kqueue_conn_io_recvbuf,
.recv = nxt_conn_io_recv,
.write = nxt_conn_io_write,
.sendbuf = nxt_conn_io_sendbuf,
#if (NXT_HAVE_FREEBSD_SENDFILE)
.old_sendbuf = nxt_freebsd_event_conn_io_sendfile,
#elif (NXT_HAVE_MACOSX_SENDFILE)
.old_sendbuf = nxt_macosx_event_conn_io_sendfile,
#else
.old_sendbuf = nxt_event_conn_io_sendbuf,
#endif
.writev = nxt_event_conn_io_writev,
.send = nxt_event_conn_io_send,
};
const nxt_event_interface_t nxt_kqueue_engine = {
"kqueue",
nxt_kqueue_create,
nxt_kqueue_free,
nxt_kqueue_enable,
nxt_kqueue_disable,
nxt_kqueue_delete,
nxt_kqueue_close,
nxt_kqueue_enable_read,
nxt_kqueue_enable_write,
nxt_kqueue_disable_read,
nxt_kqueue_disable_write,
nxt_kqueue_block_read,
nxt_kqueue_block_write,
nxt_kqueue_oneshot_read,
nxt_kqueue_oneshot_write,
nxt_kqueue_enable_accept,
nxt_kqueue_enable_file,
nxt_kqueue_close_file,
#if (NXT_HAVE_EVFILT_USER)
nxt_kqueue_enable_post,
nxt_kqueue_signal,
#else
NULL,
NULL,
#endif
nxt_kqueue_poll,
&nxt_kqueue_conn_io,
NXT_FILE_EVENTS,
NXT_SIGNAL_EVENTS,
};
static nxt_int_t
nxt_kqueue_create(nxt_event_engine_t *engine, nxt_uint_t mchanges,
nxt_uint_t mevents)
{
const nxt_sig_event_t *sigev;
engine->u.kqueue.fd = -1;
engine->u.kqueue.mchanges = mchanges;
engine->u.kqueue.mevents = mevents;
engine->u.kqueue.pid = nxt_pid;
engine->u.kqueue.changes = nxt_malloc(sizeof(struct kevent) * mchanges);
if (engine->u.kqueue.changes == NULL) {
goto fail;
}
engine->u.kqueue.events = nxt_malloc(sizeof(struct kevent) * mevents);
if (engine->u.kqueue.events == NULL) {
goto fail;
}
engine->u.kqueue.fd = kqueue();
if (engine->u.kqueue.fd == -1) {
nxt_alert(&engine->task, "kqueue() failed %E", nxt_errno);
goto fail;
}
nxt_debug(&engine->task, "kqueue(): %d", engine->u.kqueue.fd);
if (engine->signals != NULL) {
for (sigev = engine->signals->sigev; sigev->signo != 0; sigev++) {
if (nxt_kqueue_add_signal(engine, sigev) != NXT_OK) {
goto fail;
}
}
}
return NXT_OK;
fail:
nxt_kqueue_free(engine);
return NXT_ERROR;
}
static void
nxt_kqueue_free(nxt_event_engine_t *engine)
{
nxt_fd_t fd;
fd = engine->u.kqueue.fd;
nxt_debug(&engine->task, "kqueue %d free", fd);
if (fd != -1 && engine->u.kqueue.pid == nxt_pid) {
/* kqueue is not inherited by fork() */
if (close(fd) != 0) {
nxt_alert(&engine->task, "kqueue close(%d) failed %E",
fd, nxt_errno);
}
}
nxt_free(engine->u.kqueue.events);
nxt_free(engine->u.kqueue.changes);
nxt_memzero(&engine->u.kqueue, sizeof(nxt_kqueue_engine_t));
}
static void
nxt_kqueue_enable(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
nxt_kqueue_enable_read(engine, ev);
nxt_kqueue_enable_write(engine, ev);
}
/*
* EV_DISABLE is better because it eliminates in-kernel memory
* deallocation and probable subsequent allocation with a lock acquiring.
*/
static void
nxt_kqueue_disable(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
if (ev->read != NXT_EVENT_INACTIVE) {
ev->read = NXT_EVENT_INACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_READ, EV_DISABLE);
}
if (ev->write != NXT_EVENT_INACTIVE) {
ev->write = NXT_EVENT_INACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_WRITE, EV_DISABLE);
}
}
static void
nxt_kqueue_delete(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
if (ev->read != NXT_EVENT_INACTIVE) {
ev->read = NXT_EVENT_INACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_READ, EV_DELETE);
}
if (ev->write != NXT_EVENT_INACTIVE) {
ev->write = NXT_EVENT_INACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_WRITE, EV_DELETE);
}
}
/*
* kqueue(2):
*
* Calling close() on a file descriptor will remove any kevents that
* reference the descriptor.
*
* So nxt_kqueue_close() returns true only if there are pending events.
*/
static nxt_bool_t
nxt_kqueue_close(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
struct kevent *kev, *end;
ev->read = NXT_EVENT_INACTIVE;
ev->write = NXT_EVENT_INACTIVE;
end = &engine->u.kqueue.changes[engine->u.kqueue.nchanges];
for (kev = engine->u.kqueue.changes; kev < end; kev++) {
if (kev->ident == (uintptr_t) ev->fd) {
return 1;
}
}
return 0;
}
/*
* The kqueue event engine uses only three states: inactive, blocked, and
* active. An active oneshot event is marked as it is in the default
* state. The event will be converted eventually to the default EV_CLEAR
* mode after it will become inactive after delivery.
*/
static void
nxt_kqueue_enable_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
if (ev->read == NXT_EVENT_INACTIVE) {
nxt_kqueue_fd_set(engine, ev, EVFILT_READ,
EV_ADD | EV_ENABLE | EV_CLEAR);
}
ev->read = NXT_EVENT_ACTIVE;
}
static void
nxt_kqueue_enable_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
if (ev->write == NXT_EVENT_INACTIVE) {
nxt_kqueue_fd_set(engine, ev, EVFILT_WRITE,
EV_ADD | EV_ENABLE | EV_CLEAR);
}
ev->write = NXT_EVENT_ACTIVE;
}
static void
nxt_kqueue_disable_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
ev->read = NXT_EVENT_INACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_READ, EV_DISABLE);
}
static void
nxt_kqueue_disable_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
ev->write = NXT_EVENT_INACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_WRITE, EV_DISABLE);
}
static void
nxt_kqueue_block_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
if (ev->read != NXT_EVENT_INACTIVE) {
ev->read = NXT_EVENT_BLOCKED;
}
}
static void
nxt_kqueue_block_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
if (ev->write != NXT_EVENT_INACTIVE) {
ev->write = NXT_EVENT_BLOCKED;
}
}
static void
nxt_kqueue_oneshot_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
ev->write = NXT_EVENT_ACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_WRITE,
EV_ADD | EV_ENABLE | NXT_KEVENT_ONESHOT);
}
static void
nxt_kqueue_oneshot_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
ev->write = NXT_EVENT_ACTIVE;
nxt_kqueue_fd_set(engine, ev, EVFILT_WRITE,
EV_ADD | EV_ENABLE | NXT_KEVENT_ONESHOT);
}
static void
nxt_kqueue_enable_accept(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
{
ev->read = NXT_EVENT_ACTIVE;
ev->read_handler = nxt_kqueue_listen_handler;
nxt_kqueue_fd_set(engine, ev, EVFILT_READ, EV_ADD | EV_ENABLE);
}
static void
nxt_kqueue_enable_file(nxt_event_engine_t *engine, nxt_file_event_t *ev)
{
struct kevent *kev;
const nxt_int_t flags = EV_ADD | EV_ENABLE | EV_ONESHOT;
const nxt_uint_t fflags = NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND
| NOTE_ATTRIB | NOTE_RENAME | NOTE_REVOKE;
nxt_debug(&engine->task, "kevent(%d) set: id:%d ft:%i fl:%04Xd, ff:%04XuD",
engine->u.kqueue.fd, ev->file->fd, EVFILT_VNODE, flags, fflags);
kev = nxt_kqueue_get_kevent(engine);
kev->ident = ev->file->fd;
kev->filter = EVFILT_VNODE;
kev->flags = flags;
kev->fflags = fflags;
kev->data = 0;
kev->udata = nxt_kevent_set_udata(ev);
}
static void
nxt_kqueue_close_file(nxt_event_engine_t *engine, nxt_file_event_t *ev)
{
/* TODO: pending event. */
}
static void
nxt_kqueue_fd_set(nxt_event_engine_t *engine, nxt_fd_event_t *ev,
nxt_int_t filter, nxt_uint_t flags)
{
struct kevent *kev;
nxt_debug(ev->task, "kevent(%d) set event: id:%d ft:%i fl:%04Xui",
engine->u.kqueue.fd, ev->fd, filter, flags);
kev = nxt_kqueue_get_kevent(engine);
kev->ident = ev->fd;
kev->filter = filter;
kev->flags = flags;
kev->fflags = 0;
kev->data = 0;
kev->udata = nxt_kevent_set_udata(ev);
}
static struct kevent *
nxt_kqueue_get_kevent(nxt_event_engine_t *engine)
{
int ret, nchanges;
nchanges = engine->u.kqueue.nchanges;
if (nxt_slow_path(nchanges >= engine->u.kqueue.mchanges)) {
nxt_debug(&engine->task, "kevent(%d) changes:%d",
engine->u.kqueue.fd, nchanges);
ret = kevent(engine->u.kqueue.fd, engine->u.kqueue.changes, nchanges,
NULL, 0, NULL);
if (nxt_slow_path(ret != 0)) {
nxt_alert(&engine->task, "kevent(%d) failed %E",
engine->u.kqueue.fd, nxt_errno);
nxt_kqueue_error(engine);
}
engine->u.kqueue.nchanges = 0;
}
return &engine->u.kqueue.changes[engine->u.kqueue.nchanges++];
}
static void
nxt_kqueue_error(nxt_event_engine_t *engine)
{
struct kevent *kev, *end;
nxt_fd_event_t *ev;
nxt_file_event_t *fev;
nxt_work_queue_t *wq;
wq = &engine->fast_work_queue;
end = &engine->u.kqueue.changes[engine->u.kqueue.nchanges];
for (kev = engine->u.kqueue.changes; kev < end; kev++) {
switch (kev->filter) {
case EVFILT_READ:
case EVFILT_WRITE:
ev = nxt_kevent_get_udata(kev->udata);
nxt_work_queue_add(wq, nxt_kqueue_fd_error_handler,
ev->task, ev, ev->data);
break;
case EVFILT_VNODE:
fev = nxt_kevent_get_udata(kev->udata);
nxt_work_queue_add(wq, nxt_kqueue_file_error_handler,
fev->task, fev, fev->data);
break;
}
}
}
static void
nxt_kqueue_fd_error_handler(nxt_task_t *task, void *obj, void *data)
{
nxt_fd_event_t *ev;
ev = obj;
nxt_debug(task, "kqueue fd error handler fd:%d", ev->fd);
if (ev->kq_eof && ev->kq_errno != 0) {
ev->error = ev->kq_errno;
nxt_log(task, nxt_socket_error_level(ev->kq_errno),
"kevent() reported error on descriptor %d %E",
ev->fd, ev->kq_errno);
}
ev->read = NXT_EVENT_INACTIVE;
ev->write = NXT_EVENT_INACTIVE;
ev->error = ev->kq_errno;
ev->error_handler(task, ev, data);
}
static void
nxt_kqueue_file_error_handler(nxt_task_t *task, void *obj, void *data)
{
nxt_file_event_t *ev;
ev = obj;
nxt_debug(task, "kqueue file error handler fd:%d", ev->file->fd);
ev->handler(task, ev, data);
}
static nxt_int_t
nxt_kqueue_add_signal(nxt_event_engine_t *engine, const nxt_sig_event_t *sigev)
{
int signo;
struct kevent kev;
struct sigaction sa;
signo = sigev->signo;
nxt_memzero(&sa, sizeof(struct sigaction));
sigemptyset(&sa.sa_mask);
/*
* SIGCHLD must not be set to SIG_IGN, since kqueue cannot catch
* this signal. It should be set to SIG_DFL instead. And although
* SIGCHLD default action is also ignoring, nevertheless SIG_DFL
* allows kqueue to catch the signal.
*/
sa.sa_handler = (signo == SIGCHLD) ? SIG_DFL : SIG_IGN;
if (sigaction(signo, &sa, NULL) != 0) {
nxt_alert(&engine->task, "sigaction(%d) failed %E", signo, nxt_errno);
return NXT_ERROR;
}
nxt_debug(&engine->task, "kevent(%d) signo:%d (%s)",
engine->u.kqueue.fd, signo, sigev->name);
kev.ident = signo;
kev.filter = EVFILT_SIGNAL;
kev.flags = EV_ADD;
kev.fflags = 0;
kev.data = 0;
kev.udata = nxt_kevent_set_udata(sigev);
if (kevent(engine->u.kqueue.fd, &kev, 1, NULL, 0, NULL) == 0) {
return NXT_OK;
}
nxt_alert(&engine->task, "kevent(%d) failed %E", kqueue, nxt_errno);
return NXT_ERROR;
}
#if (NXT_HAVE_EVFILT_USER)
static nxt_int_t
nxt_kqueue_enable_post(nxt_event_engine_t *engine, nxt_work_handler_t handler)
{
struct kevent kev;
/* EVFILT_USER must be added to a kqueue before it can be triggered. */
kev.ident = 0;
kev.filter = EVFILT_USER;
kev.flags = EV_ADD | EV_CLEAR;
kev.fflags = 0;
kev.data = 0;
kev.udata = NULL;
engine->u.kqueue.post_handler = handler;
if (kevent(engine->u.kqueue.fd, &kev, 1, NULL, 0, NULL) == 0) {
return NXT_OK;
}
nxt_alert(&engine->task, "kevent(%d) failed %E",
engine->u.kqueue.fd, nxt_errno);
return NXT_ERROR;
}
static void
nxt_kqueue_signal(nxt_event_engine_t *engine, nxt_uint_t signo)
{
struct kevent kev;
/*
* kqueue has a builtin signal processing support, so the function
* is used only to post events and the signo argument is ignored.
*/
kev.ident = 0;
kev.filter = EVFILT_USER;
kev.flags = 0;
kev.fflags = NOTE_TRIGGER;
kev.data = 0;
kev.udata = NULL;
if (kevent(engine->u.kqueue.fd, &kev, 1, NULL, 0, NULL) != 0) {
nxt_alert(&engine->task, "kevent(%d) failed %E",
engine->u.kqueue.fd, nxt_errno);
}
}
#endif
static void
nxt_kqueue_poll(nxt_event_engine_t *engine, nxt_msec_t timeout)
{
int nevents;
void *obj, *data;
nxt_int_t i;
nxt_err_t err;
nxt_uint_t level;
nxt_bool_t error, eof;
nxt_task_t *task;
struct kevent *kev;
nxt_fd_event_t *ev;
nxt_sig_event_t *sigev;
struct timespec ts, *tp;
nxt_file_event_t *fev;
nxt_work_queue_t *wq;
nxt_work_handler_t handler;
if (timeout == NXT_INFINITE_MSEC) {
tp = NULL;
} else {
ts.tv_sec = timeout / 1000;
ts.tv_nsec = (timeout % 1000) * 1000000;
tp = &ts;
}
nxt_debug(&engine->task, "kevent(%d) changes:%d timeout:%M",
engine->u.kqueue.fd, engine->u.kqueue.nchanges, timeout);
nevents = kevent(engine->u.kqueue.fd,
engine->u.kqueue.changes, engine->u.kqueue.nchanges,
engine->u.kqueue.events, engine->u.kqueue.mevents, tp);
err = (nevents == -1) ? nxt_errno : 0;
nxt_thread_time_update(engine->task.thread);
nxt_debug(&engine->task, "kevent(%d): %d", engine->u.kqueue.fd, nevents);
if (nevents == -1) {
level = (err == NXT_EINTR) ? NXT_LOG_INFO : NXT_LOG_ALERT;
nxt_log(&engine->task, level, "kevent(%d) failed %E",
engine->u.kqueue.fd, err);
nxt_kqueue_error(engine);
return;
}
engine->u.kqueue.nchanges = 0;
for (i = 0; i < nevents; i++) {
kev = &engine->u.kqueue.events[i];
nxt_debug(&engine->task,
(kev->ident > 0x8000000 && kev->ident != (uintptr_t) -1) ?
"kevent: id:%p ft:%d fl:%04Xd ff:%d d:%d ud:%p":
"kevent: id:%d ft:%d fl:%04Xd ff:%d d:%d ud:%p",
kev->ident, kev->filter, kev->flags, kev->fflags,
kev->data, kev->udata);
error = (kev->flags & EV_ERROR);
if (nxt_slow_path(error)) {
nxt_alert(&engine->task,
"kevent(%d) error %E on ident:%d filter:%d",
engine->u.kqueue.fd, kev->data, kev->ident, kev->filter);
}
task = &engine->task;
wq = &engine->fast_work_queue;
handler = nxt_kqueue_fd_error_handler;
obj = nxt_kevent_get_udata(kev->udata);
switch (kev->filter) {
case EVFILT_READ:
ev = obj;
ev->read_ready = 1;
ev->kq_available = (int32_t) kev->data;
err = kev->fflags;
eof = (kev->flags & EV_EOF) != 0;
ev->kq_errno = err;
ev->kq_eof = eof;
if (ev->read <= NXT_EVENT_BLOCKED) {
nxt_debug(ev->task, "blocked read event fd:%d", ev->fd);
continue;
}
if ((kev->flags & NXT_KEVENT_ONESHOT) != 0) {
ev->read = NXT_EVENT_INACTIVE;
}
if (nxt_slow_path(ev->kq_available == 0 && eof && err != 0)) {
error = 1;
}
if (nxt_fast_path(!error)) {
handler = ev->read_handler;
wq = ev->read_work_queue;
}
task = ev->task;
data = ev->data;
break;
case EVFILT_WRITE:
ev = obj;
ev->write_ready = 1;
err = kev->fflags;
eof = (kev->flags & EV_EOF) != 0;
ev->kq_errno = err;
ev->kq_eof = eof;
if (ev->write <= NXT_EVENT_BLOCKED) {
nxt_debug(ev->task, "blocked write event fd:%d", ev->fd);
continue;
}
if ((kev->flags & NXT_KEVENT_ONESHOT) != 0) {
ev->write = NXT_EVENT_INACTIVE;
}
if (nxt_slow_path(eof && err != 0)) {
error = 1;
}
if (nxt_fast_path(!error)) {
handler = ev->write_handler;
wq = ev->write_work_queue;
}
task = ev->task;
data = ev->data;
break;
case EVFILT_VNODE:
fev = obj;
handler = fev->handler;
task = fev->task;
data = fev->data;
break;
case EVFILT_SIGNAL:
sigev = obj;
obj = (void *) kev->ident;
handler = sigev->handler;
data = (void *) sigev->name;
break;
#if (NXT_HAVE_EVFILT_USER)
case EVFILT_USER:
handler = engine->u.kqueue.post_handler;
data = NULL;
break;
#endif
default:
#if (NXT_DEBUG)
nxt_alert(&engine->task,
"unexpected kevent(%d) filter %d on ident %d",
engine->u.kqueue.fd, kev->filter, kev->ident);
#endif
continue;
}
nxt_work_queue_add(wq, handler, task, obj, data);
}
}
/*
* nxt_kqueue_event_conn_io_connect() eliminates the
* getsockopt() syscall to test pending connect() error.
*/
static void
nxt_kqueue_conn_io_connect(nxt_task_t *task, void *obj, void *data)
{
nxt_conn_t *c;
nxt_event_engine_t *engine;
nxt_work_handler_t handler;
const nxt_event_conn_state_t *state;
c = obj;
state = c->write_state;
switch (nxt_socket_connect(task, c->socket.fd, c->remote) ){
case NXT_OK:
c->socket.write_ready = 1;
handler = state->ready_handler;
break;
case NXT_AGAIN:
c->socket.write_handler = nxt_kqueue_conn_connected;
c->socket.error_handler = nxt_conn_connect_error;
engine = task->thread->engine;
nxt_conn_timer(engine, c, state, &c->write_timer);
nxt_kqueue_enable_write(engine, &c->socket);
return;
case NXT_DECLINED:
handler = state->close_handler;
break;
default: /* NXT_ERROR */
handler = state->error_handler;
break;
}
nxt_work_queue_add(c->write_work_queue, handler, task, c, data);
}
static void
nxt_kqueue_conn_connected(nxt_task_t *task, void *obj, void *data)
{
nxt_conn_t *c;
c = obj;
nxt_debug(task, "kqueue conn connected fd:%d", c->socket.fd);
c->socket.write = NXT_EVENT_BLOCKED;
if (c->write_state->timer_autoreset) {
nxt_timer_disable(task->thread->engine, &c->write_timer);
}
nxt_work_queue_add(c->write_work_queue, c->write_state->ready_handler,
task, c, data);
}
static void
nxt_kqueue_listen_handler(nxt_task_t *task, void *obj, void *data)
{
nxt_listen_event_t *lev;
lev = obj;
nxt_debug(task, "kevent fd:%d avail:%D",
lev->socket.fd, lev->socket.kq_available);
lev->ready = nxt_min(lev->batch, (uint32_t) lev->socket.kq_available);
nxt_kqueue_conn_io_accept(task, lev, data);
}
static void
nxt_kqueue_conn_io_accept(nxt_task_t *task, void *obj, void *data)
{
socklen_t socklen;
nxt_conn_t *c;
nxt_socket_t s;
struct sockaddr *sa;
nxt_listen_event_t *lev;
lev = obj;
c = lev->next;
lev->ready--;
lev->socket.read_ready = (lev->ready != 0);
lev->socket.kq_available--;
lev->socket.read_ready = (lev->socket.kq_available != 0);
sa = &c->remote->u.sockaddr;
socklen = c->remote->socklen;
/*
* The returned socklen is ignored here,
* see comment in nxt_conn_io_accept().
*/
s = accept(lev->socket.fd, sa, &socklen);
if (s != -1) {
c->socket.fd = s;
nxt_debug(task, "accept(%d): %d", lev->socket.fd, s);
nxt_conn_accept(task, lev, c);
return;
}
nxt_conn_accept_error(task, lev, "accept", nxt_errno);
}
/*
* nxt_kqueue_conn_io_read() is just a wrapper to eliminate the
* readv() or recv() syscall if a remote side just closed connection.
*/
static void
nxt_kqueue_conn_io_read(nxt_task_t *task, void *obj, void *data)
{
nxt_conn_t *c;
c = obj;
nxt_debug(task, "kqueue conn read fd:%d", c->socket.fd);
if (c->socket.kq_available == 0 && c->socket.kq_eof) {
nxt_debug(task, "kevent fd:%d eof", c->socket.fd);
c->socket.closed = 1;
nxt_work_queue_add(c->read_work_queue, c->read_state->close_handler,
task, c, data);
return;
}
nxt_conn_io_read(task, c, data);
}
/*
* nxt_kqueue_conn_io_recvbuf() is just wrapper around standard
* nxt_conn_io_recvbuf() to eliminate the readv() or recv() syscalls
* if there is no pending data or a remote side closed connection.
*/
static ssize_t
nxt_kqueue_conn_io_recvbuf(nxt_conn_t *c, nxt_buf_t *b)
{
ssize_t n;